// https://syzkaller.appspot.com/bug?id=1ad5e6e757812fb2378ef0abeb42214502f5417e
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/capability.h>

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

#define MAX_FDS 30

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setsid();
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  setup_binderfs();
  loop();
  exit(1);
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void close_fds()
{
  for (int fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

static void setup_sysctl()
{
  char mypid[32];
  snprintf(mypid, sizeof(mypid), "%d", getpid());
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", mypid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      close_fds();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/0x803ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x200004c0 = 0;
  *(uint32_t*)0x200004c8 = 0;
  *(uint64_t*)0x200004d0 = 0x20000480;
  *(uint64_t*)0x20000480 = 0;
  *(uint64_t*)0x20000488 = 0x92;
  *(uint64_t*)0x200004d8 = 1;
  *(uint64_t*)0x200004e0 = 0;
  *(uint64_t*)0x200004e8 = 0;
  *(uint32_t*)0x200004f0 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x200004c0ul, /*f=*/0ul);
  *(uint32_t*)0x20000200 = 0x14;
  res = syscall(__NR_getsockname, /*fd=*/r[1], /*addr=*/0x20000100ul,
                /*addrlen=*/0x20000200ul);
  if (res != -1)
    r[2] = *(uint32_t*)0x20000104;
  *(uint64_t*)0x200007c0 = 0;
  *(uint32_t*)0x200007c8 = 0;
  *(uint64_t*)0x200007d0 = 0x200000c0;
  *(uint64_t*)0x200000c0 = 0x20000880;
  *(uint32_t*)0x20000880 = 0x1b0;
  *(uint16_t*)0x20000884 = 0x24;
  *(uint16_t*)0x20000886 = 0xe0b;
  *(uint32_t*)0x20000888 = 0;
  *(uint32_t*)0x2000088c = 0;
  *(uint8_t*)0x20000890 = 0;
  *(uint8_t*)0x20000891 = 0;
  *(uint16_t*)0x20000892 = 0;
  *(uint32_t*)0x20000894 = r[2];
  *(uint16_t*)0x20000898 = 0;
  *(uint16_t*)0x2000089a = 0;
  *(uint16_t*)0x2000089c = -1;
  *(uint16_t*)0x2000089e = -1;
  *(uint16_t*)0x200008a0 = 0;
  *(uint16_t*)0x200008a2 = 0;
  *(uint16_t*)0x200008a4 = 0xa;
  *(uint16_t*)0x200008a6 = 1;
  memcpy((void*)0x200008a8, "netem\000", 6);
  *(uint16_t*)0x200008b0 = 0x180;
  *(uint16_t*)0x200008b2 = 2;
  *(uint32_t*)0x200008b4 = 0xc0;
  *(uint32_t*)0x200008b8 = 5;
  *(uint32_t*)0x200008bc = 3;
  *(uint32_t*)0x200008c0 = 0xe9;
  *(uint32_t*)0x200008c4 = 4;
  *(uint32_t*)0x200008c8 = 0x10001;
  *(uint16_t*)0x200008cc = 0x10;
  *(uint16_t*)0x200008ce = 1;
  *(uint32_t*)0x200008d0 = 5;
  *(uint32_t*)0x200008d4 = 8;
  *(uint32_t*)0x200008d8 = 0xffff;
  *(uint16_t*)0x200008dc = 0xa8;
  STORE_BY_BITMASK(uint16_t, , 0x200008de, 5, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200008df, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200008df, 1, 7, 1);
  *(uint16_t*)0x200008e0 = 0x18;
  *(uint16_t*)0x200008e2 = 1;
  *(uint32_t*)0x200008e4 = 8;
  *(uint32_t*)0x200008e8 = 3;
  *(uint32_t*)0x200008ec = 0x10000;
  *(uint32_t*)0x200008f0 = 0x3f;
  *(uint32_t*)0x200008f4 = 7;
  *(uint16_t*)0x200008f8 = 0x14;
  *(uint16_t*)0x200008fa = 2;
  *(uint32_t*)0x200008fc = 0xfff;
  *(uint32_t*)0x20000900 = 5;
  *(uint32_t*)0x20000904 = 0xda1;
  *(uint32_t*)0x20000908 = 1;
  *(uint16_t*)0x2000090c = 0x18;
  *(uint16_t*)0x2000090e = 1;
  *(uint32_t*)0x20000910 = 0x40000000;
  *(uint32_t*)0x20000914 = 0x3ff;
  *(uint32_t*)0x20000918 = 4;
  *(uint32_t*)0x2000091c = 0x257a;
  *(uint32_t*)0x20000920 = 0;
  *(uint16_t*)0x20000924 = 0x18;
  *(uint16_t*)0x20000926 = 1;
  *(uint32_t*)0x20000928 = 9;
  *(uint32_t*)0x2000092c = 0xacd;
  *(uint32_t*)0x20000930 = 0;
  *(uint32_t*)0x20000934 = 0x950;
  *(uint32_t*)0x20000938 = 8;
  *(uint16_t*)0x2000093c = 0x18;
  *(uint16_t*)0x2000093e = 1;
  *(uint32_t*)0x20000940 = 0xff80;
  *(uint32_t*)0x20000944 = 0x100;
  *(uint32_t*)0x20000948 = 0x9ec;
  *(uint32_t*)0x2000094c = 0xffff;
  *(uint32_t*)0x20000950 = 0x8000;
  *(uint16_t*)0x20000954 = 0x18;
  *(uint16_t*)0x20000956 = 1;
  *(uint32_t*)0x20000958 = 2;
  *(uint32_t*)0x2000095c = 0x761;
  *(uint32_t*)0x20000960 = 1;
  *(uint32_t*)0x20000964 = 0x3ff;
  *(uint32_t*)0x20000968 = 0x9a;
  *(uint16_t*)0x2000096c = 0x18;
  *(uint16_t*)0x2000096e = 1;
  *(uint32_t*)0x20000970 = 0x40000;
  *(uint32_t*)0x20000974 = 6;
  *(uint32_t*)0x20000978 = 9;
  *(uint32_t*)0x2000097c = 0xffff;
  *(uint32_t*)0x20000980 = 0x70e21d79;
  *(uint16_t*)0x20000984 = 0x2c;
  *(uint16_t*)0x20000986 = 0xc;
  *(uint64_t*)0x20000988 = 0xffffffff;
  *(uint64_t*)0x20000990 = 0;
  *(uint32_t*)0x20000998 = 4;
  *(uint32_t*)0x2000099c = 0;
  *(uint64_t*)0x200009a0 = 0x7fffffffffffffff;
  *(uint64_t*)0x200009a8 = 0x56f;
  *(uint16_t*)0x200009b0 = 4;
  *(uint16_t*)0x200009b2 = 2;
  *(uint16_t*)0x200009b4 = 0xc;
  *(uint16_t*)0x200009b6 = 0xb;
  *(uint64_t*)0x200009b8 = 0xfffffffffffffff8;
  *(uint16_t*)0x200009c0 = 0x51;
  *(uint16_t*)0x200009c2 = 2;
  memcpy((void*)0x200009c4,
         "\xf6\xee\x05\xf8\x95\xb5\x1a\x08\xa5\x65\xa9\xc4\xa7\x63\x72\x73\x40"
         "\x0e\xc3\x95\xb4\x8f\x19\xb3\xcd\x37\xd5\x5c\x40\x91\x81\x98\xa9\x6a"
         "\xba\x8b\x38\x42\x13\x9d\x60\x01\x82\xec\x69\xcc\xc0\x2c\xee\xa6\x6a"
         "\xf0\x55\xf1\xf9\x26\xca\x32\x6e\x48\x7f\x05\x8c\x34\x12\xf8\x5e\x26"
         "\xa2\x7d\xb1\x9b\x51\xb8\x5f\xc8\xe4",
         77);
  *(uint16_t*)0x20000a14 = 0x14;
  *(uint16_t*)0x20000a16 = 6;
  *(uint32_t*)0x20000a18 = 7;
  *(uint32_t*)0x20000a1c = 0x401;
  *(uint32_t*)0x20000a20 = 0x7fff;
  *(uint32_t*)0x20000a24 = 0x1ff;
  *(uint16_t*)0x20000a28 = 8;
  *(uint16_t*)0x20000a2a = 7;
  *(uint32_t*)0x20000a2c = 0;
  *(uint64_t*)0x200000c8 = 0x1b0;
  *(uint64_t*)0x200007d8 = 1;
  *(uint64_t*)0x200007e0 = 0;
  *(uint64_t*)0x200007e8 = 0;
  *(uint32_t*)0x200007f0 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200007c0ul, /*f=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  setup_sysctl();
  do_sandbox_none();
  return 0;
}